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United States Patent | 5,027,913 |
Nguyen | July 2, 1991 |
The inserts for a roller cone of a multiple cone rock bit are positioned or angled in the cone to attack an earthen formation such that the inserts are subjected to more compressive forces and the formation is subjected to more shear forces as the roller cutters roll over the bottom of the formation.
Inventors: | Nguyen; Quan V. (Spring, TX) |
Assignee: | Smith International, Inc. (Houston, TX) |
Appl. No.: | 507827 |
Filed: | April 12, 1990 |
Current U.S. Class: | 175/336; 175/341; 175/353; 175/431 |
Intern'l Class: | E21B 010/16 |
Field of Search: | 175/336,341,350,351,353,355,370,401,410 |
2038386 | Apr., 1936 | Scott et al. | 175/353. |
3385385 | May., 1968 | Kucera et al. | 175/378. |
3743038 | Jul., 1973 | Bennett | 175/341. |
3763942 | Oct., 1973 | Levitt | 175/354. |
4108260 | Aug., 1978 | Bozarth | 175/374. |
4187922 | Feb., 1980 | Phelps | 175/378. |
4415208 | Nov., 1983 | Goyarts | 299/91. |
4641718 | Feb., 1987 | Bengtsson | 175/353. |
4751972 | Jun., 1988 | Jones et al. | 175/336. |